JPS61214403A - Cryogenic apparatus - Google Patents

Abstract

PURPOSE:To automatically lower the temperature of a return cooling medium for precooling a superconductive coil without the use of an expensive control valve and its controller by providing a heat exchanger in the precooling medium channel, cooling a superconductive coil through the heat exchanger, and exchanging heat between part of the return precooling medium raised in temperature and the precooling medium. CONSTITUTION:Precooling helium gas flowing through the inlet section 10a of a heat exchanger 10 in the temperature level as low as in liquid nitrogen exchanges heat with the superconductive coil 6 to become a return gas raised in temperature. Part of the return gas is led to the vessel 11 through an adiabatic pipe 12 to raise the temperature of the precooling gas at the outlet of the heat exchanger 10 to a value appropriate for precooling by exchanging heat in the heat exchanger 10. By setting the opening ratio of valves 14a, 14b to a suitable value at the initial stage of precooling, the temperature of the gas led to the vessel 11 via the pipe 12 drops in response to temperature drop of the coil 6, resulting in an automatic temperature drop in the precooling gas passing through the outlet section 10b of the heat exchanger 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cryogenic device for cooling superconducting coils.

[Conventional technology]

FIG. 2 shows, for example, Procedures of th
e 9thIn-international Cryog
enic Kngineering Conference
ce.

This is a simplified version of Figure 2 on page 96 of KOBJ Japan (1982), but it shows a conventional cryogenic device. In the figure, (1) is a refrigerator,
(2) is a heat exchanger, (3) is a liquid nitrogen pipe, (4) is a helium gas compressor, (6) is a control valve, (6) is a superconducting coil, and (7) is a superconducting coil (6). +81 is a cooling pipe that leads the low-flow helium gas that has passed through the refrigerator (11) to the cryogenic container (7); This is a return pipe that returns to the helium gas compressor (4).

Next, I will explain about Dokui. The helium gas discharged from the helium compressor m[41 passes through the heat exchanger (2),
It exchanges heat with the liquid nitrogen introduced by the liquid nitrogen pipe (3), becomes low-temperature helium gas at the liquid nitrogen temperature level, and is pumped through the cooling pipe (8) to the cryogenic container (7), which initially reaches room temperature. The superconducting coil (6) in the state is cooled down. At this time, if the superconducting coil (6) is cooled with helium gas that has been cooled down to the liquid nitrogen return level from the initial stage of pre-cooling, large thermal distortion occurs, which adversely affects the superconducting coil (6) in some cars. Therefore, for example, as shown in the figure, the control valve (
6), helium gas at room temperature and helium gas at the liquid nitrogen temperature level are mixed, and the degree of pre-cooling helium gas is controlled by a controller (P shown in the figure) to prevent large thermal distortion from occurring. .

[Problem that the invention seeks to solve]

Conventional cryogenic equipment is 11IIF! Since the temperature of the pre-cooled helium gas is adjusted depending on the magnitude of strain generated in the superconducting coil, there is a problem in that the control valve and its controller have a high displacement.

This invention was made to solve the above-mentioned problems, and provides a cryogenic apparatus in which the temperature of pre-cooled helium gas gradually decreases.

[Means for solving problems]

The cryogenic equipment according to the present invention includes a heat exchanger on a cooling pipe connecting a refrigerator and a cryogenic container in which a superconducting coil is housed, a container in which the heat exchanger is housed, and a cryogenic It is equipped with insulated piping from one storage container to another, and a return piping that returns the cooling medium in the container to the room temperature section of the refrigerator.

[Effect]

In the cryogenic device of this invention, the temperature of the cooling medium gradually decreases, and the temperature of the body gradually decreases, so the pre-cooling cooling is carried out by exchanging heat with the cooling medium in a heat exchanger. The medium temperature also gradually decreases, and the precooling medium temperature is automatically controlled.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
For meat, +I01 is the heat exchanger provided in the cooling distribution path (8), (10a) the inlet of the heat exchanger, (10'b
) is the exit part of the diaphragm. α1) is a heat exchanger (container containing 1α), (A) is an insulated pipe for guiding a part of the return gas from the cryogenic container (7) to container 0υ, and (to) is the helium inside the container αυ. A return pipe (4m) and (14b) n valves return the gas to the normal temperature part of the refrigerator fi+, that is, the helium gas compressor 14) via the return pipe (9). f
il ~+91 is the same as in FIG.

Next, the operation will be explained. In Figure 1 of the paper.

The precooled helium gas flowing through the inlet (10a) of the heat exchanger (lO) is a low temperature gas at the liquid nitrogen temperature level, and this low temperature precooled gas exchanges heat with the superconducting coil (6) to The returned gas becomes a high temperature gas, and by exchanging heat with a part of the pre-cooled gas led to the container α℃ via the heat exchanger (10) through the adiabatic piping Q2, the return gas returns to the outlet (10b) of the heat exchanger (lO). ), the temperature is raised to an appropriate temperature for pre-cooling.

If the opening ratio of the valves (14a) and (14b) is set to an appropriate value at the initial stage of pre-cooling, as the temperature of the superconducting coil (6) decreases, the temperature of the container will be reduced via the insulated piping. The temperature of the gas that cannot be led to the heat exchanger (lO1) also decreases, and the temperature of the precooled gas that passes through the outlet (10b) of the heat exchanger (lO1) also decreases automatically.

In the above embodiment, the valve (14a) was provided on the return pipe α1 from the container αη to the helium gas compressor (4), but the valve (14a) may also be provided on the insulated pipe @.

Even if you omit the valve (na) and only the valve (14b),
The intended purpose is to be a distant relative.

〔Effect of the invention〕

As described above, according to the present invention, the pre-cooling cooling medium path -
A heat exchanger was installed, and the superconducting coil was cooled through this value exchanger to exchange heat between the pre-cooled cooling medium and a portion of the returned pre-cooled cooling medium whose temperature had increased, thus eliminating the need for expensive adjustment. This has the advantage that the temperature of the superconducting coil precooling medium can be lowered automatically without using a valve or its controller.

[Brief explanation of drawings]

Figure 1 is a system diagram showing a cryogenic apparatus according to an embodiment of the present invention, and Figure 2 is a conventional cryogenic apparatus. It is a system diagram showing A device. In the figure, fllP′i refrigerator, f6) Fi over 1ft
conductive coil. (7) is a cryogenic container, (8) is a cooling pipe, (9) is a return pipe, (lO) is a heat exchanger, αυ container, (Ll is an insulated pipe, and α3 is a return pipe. The same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A cryogenic container in which an object to be cooled is housed, a refrigerator that lowers the temperature of a medium to be cooled that cools the object to be cooled to a cryogenic temperature, and a low-temperature part of this refrigerator is connected to the cryogenic container to cool the object. A cooling pipe that guides the medium into the cryogenic container, and a return pipe that returns the cooling medium in the cryogenic container to the normal temperature part of the refrigerator, wherein the cooling pipe is arranged in the cooling pipe and a heat exchanger is housed therein. The refrigerator is characterized by comprising: a container in which the cooling medium is heated, an insulated pipe that guides a part of the cooling medium in the cryogenic container into the container, and a return pipe that returns the cooling medium in the container to the normal temperature part of the refrigerator. cryogenic equipment. (2) The cryogenic apparatus according to claim 1, wherein a valve is disposed in the return pipe.